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| Current File : //sys/net80211/ieee80211_radiotap.h |
/* $FreeBSD: release/9.1.0/sys/net80211/ieee80211_radiotap.h 174568 2007-12-13 01:23:40Z sam $ */
/* $NetBSD: ieee80211_radiotap.h,v 1.16 2007/01/06 05:51:15 dyoung Exp $ */
/*-
* Copyright (c) 2003, 2004 David Young. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of David Young may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifndef _NET80211_IEEE80211_RADIOTAP_H_
#define _NET80211_IEEE80211_RADIOTAP_H_
/* A generic radio capture format is desirable. It must be
* rigidly defined (e.g., units for fields should be given),
* and easily extensible.
*
* The following is an extensible radio capture format. It is
* based on a bitmap indicating which fields are present.
*
* I am trying to describe precisely what the application programmer
* should expect in the following, and for that reason I tell the
* units and origin of each measurement (where it applies), or else I
* use sufficiently weaselly language ("is a monotonically nondecreasing
* function of...") that I cannot set false expectations for lawyerly
* readers.
*/
#if defined(__KERNEL__) || defined(_KERNEL)
#ifndef DLT_IEEE802_11_RADIO
#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */
#endif
#endif /* defined(__KERNEL__) || defined(_KERNEL) */
#define IEEE80211_RADIOTAP_HDRLEN 64 /* XXX deprecated */
/*
* The radio capture header precedes the 802.11 header.
*
* Note well: all radiotap fields are little-endian.
*/
struct ieee80211_radiotap_header {
uint8_t it_version; /* Version 0. Only increases
* for drastic changes,
* introduction of compatible
* new fields does not count.
*/
uint8_t it_pad;
uint16_t it_len; /* length of the whole
* header in bytes, including
* it_version, it_pad,
* it_len, and data fields.
*/
uint32_t it_present; /* A bitmap telling which
* fields are present. Set bit 31
* (0x80000000) to extend the
* bitmap by another 32 bits.
* Additional extensions are made
* by setting bit 31.
*/
} __packed;
/*
* Name Data type Units
* ---- --------- -----
*
* IEEE80211_RADIOTAP_TSFT uint64_t microseconds
*
* Value in microseconds of the MAC's 64-bit 802.11 Time
* Synchronization Function timer when the first bit of the
* MPDU arrived at the MAC. For received frames, only.
*
* IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap
*
* Tx/Rx frequency in MHz, followed by flags (see below).
*
* IEEE80211_RADIOTAP_FHSS uint16_t see below
*
* For frequency-hopping radios, the hop set (first byte)
* and pattern (second byte).
*
* IEEE80211_RADIOTAP_RATE uint8_t 500kb/s or index
*
* Tx/Rx data rate. If bit 0x80 is set then it represents an
* an MCS index and not an IEEE rate.
*
* IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
* one milliwatt (dBm)
*
* RF signal power at the antenna, decibel difference from
* one milliwatt.
*
* IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
* one milliwatt (dBm)
*
* RF noise power at the antenna, decibel difference from one
* milliwatt.
*
* IEEE80211_RADIOTAP_DB_ANTSIGNAL uint8_t decibel (dB)
*
* RF signal power at the antenna, decibel difference from an
* arbitrary, fixed reference.
*
* IEEE80211_RADIOTAP_DB_ANTNOISE uint8_t decibel (dB)
*
* RF noise power at the antenna, decibel difference from an
* arbitrary, fixed reference point.
*
* IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless
*
* Quality of Barker code lock. Unitless. Monotonically
* nondecreasing with "better" lock strength. Called "Signal
* Quality" in datasheets. (Is there a standard way to measure
* this?)
*
* IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless
*
* Transmit power expressed as unitless distance from max
* power set at factory calibration. 0 is max power.
* Monotonically nondecreasing with lower power levels.
*
* IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB)
*
* Transmit power expressed as decibel distance from max power
* set at factory calibration. 0 is max power. Monotonically
* nondecreasing with lower power levels.
*
* IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
* one milliwatt (dBm)
*
* Transmit power expressed as dBm (decibels from a 1 milliwatt
* reference). This is the absolute power level measured at
* the antenna port.
*
* IEEE80211_RADIOTAP_FLAGS uint8_t bitmap
*
* Properties of transmitted and received frames. See flags
* defined below.
*
* IEEE80211_RADIOTAP_ANTENNA uint8_t antenna index
*
* Unitless indication of the Rx/Tx antenna for this packet.
* The first antenna is antenna 0.
*
* IEEE80211_RADIOTAP_XCHANNEL uint32_t bitmap
* uint16_t MHz
* uint8_t channel number
* int8_t .5 dBm
*
* Extended channel specification: flags (see below) followed by
* frequency in MHz, the corresponding IEEE channel number, and
* finally the maximum regulatory transmit power cap in .5 dBm
* units. This property supersedes IEEE80211_RADIOTAP_CHANNEL
* and only one of the two should be present.
*/
enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_TSFT = 0,
IEEE80211_RADIOTAP_FLAGS = 1,
IEEE80211_RADIOTAP_RATE = 2,
IEEE80211_RADIOTAP_CHANNEL = 3,
IEEE80211_RADIOTAP_FHSS = 4,
IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
IEEE80211_RADIOTAP_ANTENNA = 11,
IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
/* NB: gap for netbsd definitions */
IEEE80211_RADIOTAP_XCHANNEL = 18,
IEEE80211_RADIOTAP_EXT = 31,
};
#ifndef _KERNEL
/* channel attributes */
#define IEEE80211_CHAN_TURBO 0x00000010 /* Turbo channel */
#define IEEE80211_CHAN_CCK 0x00000020 /* CCK channel */
#define IEEE80211_CHAN_OFDM 0x00000040 /* OFDM channel */
#define IEEE80211_CHAN_2GHZ 0x00000080 /* 2 GHz spectrum channel. */
#define IEEE80211_CHAN_5GHZ 0x00000100 /* 5 GHz spectrum channel */
#define IEEE80211_CHAN_PASSIVE 0x00000200 /* Only passive scan allowed */
#define IEEE80211_CHAN_DYN 0x00000400 /* Dynamic CCK-OFDM channel */
#define IEEE80211_CHAN_GFSK 0x00000800 /* GFSK channel (FHSS PHY) */
#define IEEE80211_CHAN_GSM 0x00001000 /* 900 MHz spectrum channel */
#define IEEE80211_CHAN_STURBO 0x00002000 /* 11a static turbo channel only */
#define IEEE80211_CHAN_HALF 0x00004000 /* Half rate channel */
#define IEEE80211_CHAN_QUARTER 0x00008000 /* Quarter rate channel */
#endif /* !_KERNEL */
/* For IEEE80211_RADIOTAP_FLAGS */
#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
* during CFP
*/
#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
* with short
* preamble
*/
#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
* with WEP encryption
*/
#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
* with fragmentation
*/
#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
* 802.11 header and payload
* (to 32-bit boundary)
*/
#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
#define IEEE80211_RADIOTAP_F_SHORTGI 0x80 /* HT short GI */
#endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */